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d in (-oo:+oo)
2*(7*d-10) = -6 // + 6
2*(7*d-10)+6 = 0
2*(7*d-10)+6 = 0
14*d-14 = 0
14*d-14 = 0
14*d-14 = 0 // + 14
14*d = 14 // : 14
d = 14/14
d = 1
d = 1
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